Three-dimensional MnCo2O4/graphene composites for supercapacitor with promising electrochemical properties

A three-dimensional (3D) porous structure that designed based on MnCo2O4 decorated graphene was synthesized by a two-step method. The precursor was prepared of MnCo2O4 by solid phase synthesis method, then in the hydrothermal reaction course, the graphene nanosheets as well as this precursor were self-assembled into a 3D interconnected network. The resultant composite materials present a higher specific capacitance (503 F g(-1) at 1 A g(-1) current density) and an excellent cycling stability. After 5000 charge/discharge cycles at a current density of 10 A g(-1), 97.4% of the specific capacitance was retained. Thus, this material has a promising application potential for supercapacitor, at the same time, this synthetic method can also provide an idea for synthesizing composites based on 3D graphene in the future. (c) 2019 Published by Elsevier B.V.